Fix PagedSpace size accounting.

src/mark-compact.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/base/atomicops.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/cpu-profiler.h"
@@ skipping 3929 matching lines @@
 
 
 template<MarkCompactCollector::SweepingParallelism mode>
 static intptr_t Free(PagedSpace* space,
                      FreeList* free_list,
                      Address start,
                      int size) {
   if (mode == MarkCompactCollector::SWEEP_ON_MAIN_THREAD) {
     return space->Free(start, size);
   } else {
+    // TODO(hpayer): account for wasted bytes in concurrent sweeping too.
     return size - free_list->Free(start, size);
   }
 }
 
 
 // Force instantiation of templatized SweepConservatively method for
 // SWEEP_ON_MAIN_THREAD mode.
 template intptr_t MarkCompactCollector::
     SweepConservatively<MarkCompactCollector::SWEEP_ON_MAIN_THREAD>(
         PagedSpace*, FreeList*, Page*);
@@ skipping 535 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal